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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41f7c642ec1b44605e1dd120e41e069660d718550e7aa3b56c23ecf57181a62b' 
  AND token = '8MKc/EKzVkCYZoTFqhYVLn5NxTBuePuZdp96VQMsS68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}